A class to loop over DSTs and apply selection criteria for the 2012 Sterile analysis. Creates histograms of the total energy spectra, and spectra for CC- and NC-selected events separately. If MC DSTs are supplied, also creates Reco-vs-True matrices for each of 5 categories of events: true NC, true CC numu, beam nue, appeared nue, and appeared nutau. These matrices are created for CC- and NC-selected events as well.